Seal rings for potable water applications

(19)

(11)

EP 1 236 937 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	15.01.2003 Bulletin 2003/03

(43)	Date of publication A2:
	04.09.2002 Bulletin 2002/36

(21)	Application number: 02445014.0

(22)	Date of filing: 07.02.2002

(51)	International Patent Classification (IPC)⁷: F16J 15/02, C22C 29/00

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

08.02.2001 SE 0100398

(71)	Applicant: Sandvik AB
	81181 Sandviken (SE)

(72)	Inventors:
	Ederyd, Stefan 132 47 Saltsjö-Boo (SE) Pauty, Emmanuel 38130 Echirolles (FR)

(74)	Representative: Taquist, Lennart et al
	Sandvik AB Patent Department 811 81 SANDVIKEN 811 81 SANDVIKEN (SE)

(54)	Seal rings for potable water applications

(57) The present invention relates to cemented carbide seal rings consisting of at least one hard phase in a binder phase based on Co, Ni and Fe giving a content Fe, Ni and Cr of less than 50 µg/l of each in a leach test with deionized water at 85°C performed according to the requirements of British Standard BS6920: Section 2.6: 1996.

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